Reduced binding of human antibodies to cells from GGTA1/CMAH KO pigs.

Reduced binding of human antibodies to cells from GGTA1/CMAH KO pigs.
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DOI:
10.1111/ajt.12744
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发表时间:
2014-08
期刊:
American journal of transplantation : official journal of the American Society of Transplantation and the American Society of Transplant Surgeons
影响因子:
--
通讯作者:
Tector AJ
Tector AJ
中科院分区:
其他
文献类型:
--
作者:
Burlak C;Paris LL;Lutz AJ;Sidner RA;Estrada J;Li P;Tector M;Tector AJ

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利用转基因猪器官进行异种移植可以解决供体器官短缺的问题。两个使人类区别于猪的失活基因是GGTA1和CMAH,它们的产物产生碳水化合物表位agal和Neu5Gc,它们吸引预先形成的人类抗体。在初步分析中,当GGTA1和CMAH基因在猪中缺失时,人抗体结合减少。我们分析了121例健康人血清中人IgM和Ig G与GGTA1 KO和GGTA1/CMAHKO外周血单核细胞(PBMC)的结合。我们分析了一个亚群对转基因猪PBMC的反应性,并与黑猩猩和人PBMC进行了比较。猪的GGTA1和CMAH基因的缺失改善了交叉匹配的结果,而不是在黑猩猩身上观察到的结果。对121个针对GGTA1/CMAH KO猪PBMC进行测试的人类样本进行分类,没有发现血型、年龄或性别等明显特征。修改基因,使猪的碳水化合物更接近人类,显著改善了与人血清的交叉匹配。
Xenotransplantation using genetically modified pig organs could solve the donor organ shortage problem. Two inactivated genes that make humans unique from pigs are GGTA1 and CMAH, the products of which produce the carbohydrate epitopes, aGal and Neu5Gc that attract preformed human antibody. When the GGTA1 and CMAH genes were deleted in pigs human antibody binding was reduced in preliminary analysis. We analyzed the binding of human IgM and IgG from 121 healthy human serum samples for binding to GGTA1 KO and GGTA1/CMAH KO peripheral blood mononuclear cells (PBMC). We analyzed a sub population for reactivity towards genetically modified pig PBMC as compared to chimpanzee and human PBMC. Deletion of the GGTA1 and CMAH genes in pigs improved the crossmatch results beyond those observed with chimpanzees. Sorting the 121 human samples tested against the GGTA1/CMAH KO pig PBMC did not reveal a distinguishing feature such as blood group, age or gender. Modification of genes to make pig carbohydrates more similar to humans has improved the cross match with human serum significantly.
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